for more information.
The zpool status paints a very gloomy picture:
pool: fileserver
state: ONLINE
status: One or more devices is currently being resilvered. The pool will
continue to function, possibly in a degraded state.
action: Wait for the resilver to complete.
scan: resilver in progress since Fri Jun 29 11:59:59 2012
858K scanned out of 15.7T at 43/s, (scan is slow, no estimated time)
567K resilvered, 0.00% done
config: